Eaton / Cutler-Hammer FDP365BR – 400A, 3-Pole Vertical Main Fusible Panel-Mount Switch – FDP Series

The Eaton / Cutler-Hammer FDP365BR is a rugged, industrial-duty main fusible panel-mount switch designed to deliver reliable load isolation and precise overcurrent protection in switchboards and panelboards. With a robust 400A rating and a 3-pole configuration, this vertical, panel-mount device is built to simplify safe power control in demanding environments.

• 400A, 3-Pole protection: Provides a strong, single-location disconnect for main feeds while delivering dedicated protection for downstream circuits, making maintenance safer and more straightforward.
• Vertical panel-mount configuration: Engineered for vertical installation to align with standard FDP Series footprints and to integrate seamlessly into existing panel layouts, including legacy Westinghouse FDP installations.
• FDP Series reliability: A core component of Eaton’s FDP lineup, designed for consistent performance in industrial switchboards and panelboards with long service life and predictable fusing behavior.
• Integrated fusible protection: Combines disconnection capability with fusible protection in a single assembly, reducing auxiliary parts and simplifying field wiring for easier, safer upkeep.
• Industrial-purpose versatility: Ideal for main service isolation in manufacturing facilities, machine control panels, data centers, and other environments where dependable power control and clear, visible isolation are essential.
• Backward compatibility: Marketed as a legacy-compatible solution for vertical main switches (Westinghouse FDP lineage), helping facilities upgrade or replace aging equipment without a complete panel redesign.

Why this matters: when safety, reliability, and simplicity matter most, the FDP365BR offers a streamlined solution for main power control. The combination of a sturdy 400A rating, clean 3-pole isolation, and vertical mounting reduces install complexity and maintenance downtime, while ensuring compliant, visible isolation for safe servicing of electrical systems.

Who benefits most: electrical engineers, facility managers, and maintenance teams overseeing switchboards and panelboards in industrial settings—anyone seeking a dependable main disconnect with integrated overcurrent protection that reduces component count and simplifies panel layouts.

Use cases and practical scenarios:

• Installing a main service disconnect in mid-sized industrial panelboards to protect feeders and downstream equipment.
• Upgrading aging vertical main switches in legacy FDP panels to a current FDP365BR while preserving panel layout and mounting compatibility.
• Providing a clear, reliable shutdown point for machine control panels and service entrances in facilities with strict maintenance protocols.

Practical tips for install and operation:

• Verify vertical mounting compatibility with your existing FDP-Series panels to ensure a seamless fit.
• Match the fusible elements to downstream protection requirements and follow all applicable electrical codes for safe replacement and maintenance.
• Keep a spare, correctly rated fusible link set on hand to minimize downtime during fuse changes and ensure quick restoration of service after protection events.

For projects requiring a robust, ready-to-install main disconnect with integrated protection, the FDP365BR from Eaton / Cutler-Hammer delivers proven performance, straightforward integration, and the reliability you expect from the FDP Series—backed by compatibility with legacy Westinghouse FDP vertical main switches and designed to fit neatly into modern panelboard applications.